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    <title>Document</title>
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    请输入第一个数：<input type="text" id="num1" ><br>
    请输入第二个数：<input type="text" id="num2" ><br>
    <input type="button" value="+" onclick="plus()"><br>  
   <input type="button" value="-" onclick="jian()"><br> 
    <input type="button" value="*" onclick="cheng()"><br>
    <input type="button" value="/" onclick="chu()"><br> 
    结果：<input type="text" id="result"><br>
   
    
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